CN103356199A - Method for manifesting metal surface hidden fingerprints through chemical sedimentation - Google Patents
Method for manifesting metal surface hidden fingerprints through chemical sedimentation Download PDFInfo
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- CN103356199A CN103356199A CN2013103061924A CN201310306192A CN103356199A CN 103356199 A CN103356199 A CN 103356199A CN 2013103061924 A CN2013103061924 A CN 2013103061924A CN 201310306192 A CN201310306192 A CN 201310306192A CN 103356199 A CN103356199 A CN 103356199A
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Abstract
The invention relates to a method for manifesting metal surface hidden fingerprints through chemical sedimentation, and belongs to the technical field of fingerprints identification. The method takes copper sulfate solution as the replacement reagent, manifests hidden fingerprints on metals such as zinc, magnesium and general carbon steel, and particularly comprises the following steps: copper sulfate solution is prepared by taking copper sulfate and ultrapure water as raw materials, and the concentration of the solution is mainly depended on the nature of metal substrate material; the hidden fingerprint sample is submerged in the copper sulfate solution, or the solution is dropped on the sample material surface, and reaction is carried out for a period of time; the sample is dried by nitrogen after being taken out, the fingerprints can be detected clearly with the naked eye, and the manifested fingerprint image is gathered through a digital camera. According to the manifesting method, no expensive instrument or fluorescent reagent are need, and the manifesting method is simple to operate and fast to manifest fingerprints, is healthy and eco-friendly, low in cost, and ideal in sensitivity, veracity and repeatability, and has better application prospect in the field of fingerprint identification.
Description
Technical field
The present invention relates to adopt the chemical replacement deposition technique to manifest the method for metal surface laten fingerprints, belong to the technique of fingerprint indentification field.
Background technology
The lines of fingerprint is different in pattern, breakpoint and cross point, in information processing, they are called feature, and these features have uniqueness and permanent, therefore we just can be mapped a people with his fingerprint, by his fingerprint characteristic of comparison and the fingerprint characteristic of pre-save, just can verify his true identity.Common fingerprint is divided three classes: the first kind is obvious stricture of vagina, and visual exactly is visible lines.Being stained with the article transfer printings such as paint, blood, ink such as hands and forming, all is to be imprinted on to become basic document on the finger-print card usually; Equations of The Second Kind is the molding stricture of vagina, and this refers at soft material, the fingerprint of finding at wax candle, clay such as the hands contact printing; The 3rd class is laten fingerprints, this class fingerprint is through health nature secretions such as perspiration, oils and fats, shift the fingerprint lines that forms, visual difficult discovery, usually need physics or the chemistry etc. method it is manifested or strengthen after again Information Monitoring use, being modal fingerprint in the spot, also is the object of study in this patent.The fingerprint material evidence finds because it is on-the-spot that extraction ratio is high, expert's conclusion is reliable and direct human identifying, high efficiency data base querying ability, in material evidence evaluation solving criminal cases, play an important role, first of the DNA material evidence is acknowledged as material evidence, have very important Research Significance and using value.
Along with the arriving of the global tide of IT application and the rise of network, safety is increasingly strong with the demand of carrying out easily information exchange.Increasing individual, company and government bodies think that all existing identification system based on various certificates, smart card, IC-card and password is loaded down with trivial details and very unreliable.We know, fingerprint has can't be falsely used and use, be not afraid of loss, need not carry, can not forget, personal feature invariance and uniqueness, stability and nongenetic, these unique advantages develop fingerprint identification technology rapidly becomes the most ripe, accurate, cheap and easy-to-use the most convenient and safe identity identifying technology, becomes gradually IT product field and security product field new life's technical force.Can say, fingerprint identification technology has been started the New Times in identity authentication field, just uses infiltration and development with irresistible strength to the common people, and wide market prospect is arranged.At present, this technology has become the in the world study hotspot in identity discriminating field.
Fingerprint manifestation is that potential or faint fingerprint development (or enhancing) is become high-visible fingerprint, refers to
The basic core of stricture of vagina inspection technology.According to the technical role principle, classical fingerprint manifestation method mainly is divided three classes: (1) optics process for show, such as orienting reflex, shortwave ultraviolet reflectance and visible fluorescence etc.; (2) physics process for show is such as vacuum metal deposition (VMD), small-particle suspension (SP), physical developer (PD) and powder etc.; (3) chemistry manifests, such as DFO and 1,2,3-indantrione monohydrate etc.Common every kind of process for show is applicable specific object and fingerprint composition only, and the fingerprint sample can be divided into permeability object and impermeability object for this reason, crestal line antiperspirant fingerprint and sebum antiperspirant fingerprint.There are many deficiencies such as sensitive, not accurate enough not, that clear not, information extraction is limited in traditional developing latent finger prints using method.In the scene of a crime, the fingerprint that the suspect stays is ever-changing, and the detection of some of them fingerprint can't realize with existing technical method; More particularly leave over the fingerprint that the time is long, the amount of leaving over is few, be difficult to it is manifested with macro approach (for example powder method and reagent method).
Need to develop the practical situation that multiple diverse ways differs greatly to adapt to object in the practice.
Summary of the invention
The objective of the invention is: for the feature of environmental protection, sensitivity, the real-time of fingerprint detection, the cost degradation demand the invention provides a kind of the deposition based on the copper-bath chemical replacement and manifests metal surface laten fingerprints method.
Target of the present invention mainly provide a kind of simple, cheap, in real time, fast, to the detection method of the harmless highly sensitive metal surface laten fingerprints of operator.
The present invention adopts copper-bath to manifesting than laten fingerprints on the object of active metal (as: zinc, magnesium, ordinary carbon steel).This method utilize copper sulfate can not with fingerprint residues thing reaction, only optionally with the principle of active metal reaction, at fingerprint valley line zone reaction replacement deposition last layer copper, thereby form aberration and manifest fingerprint with the fingerprint ridge line zone.Specifically comprise: take copper sulfate, ultra-pure water as raw material is made into copper-bath, for the different materials metallic substrates, be configured to variable concentrations solution copper sulfate.Fingerprint sample is dipped in desired concn solution, or solution is dripped, is sprayed on the object surface, through the certain hour reaction, sample is taken out N
2Dry up, namely can be observed clear impression of the hand.This process for show is easy and simple to handle, with low cost, low-carbon environment-friendly, be swift in response that (a few minutes get final product) efficient is high, repeatability is strong.
The present invention is a kind of for than developing latent finger prints using new method on the object of active metal, it is characterized in that, take copper-bath as reactant liquor, utilize itself and active metal object generation displacement reaction, and not with the principle of fingerprint residues thing reaction, fingerprint is displayed with sensitivity;
The method concrete operations may further comprise the steps:
(1) take copper sulphate pentahydrate (or anhydrous cupric sulfate), ultra-pure water (or deionized water) as raw material, configuration copper sulfate mother solution.
(2) electronic analytical balance takes by weighing the 12.484g copper sulphate pentahydrate, places the 100ml volumetric flask, adds ultra-pure water to the 100ml place, fully mixing.For subsequent use.
A: be directed to zinc metallic substrates laten fingerprints
(1) gets mother solution and dilution according to fingerprint object size.For sheet metal or the not thick substrate of thickness, how much get solution according to being: the mother solution volume/object area of getting=40 μ l/ ㎝
2, and with 100 times of mother solution dilutions, mixing;
(2) object is immersed in the reaction solution reaction 100s;
(3) zinc metal object is taken out, dry up with nitrogen, can obtain clear fingerprint.
B: be directed to laten fingerprints at the bottom of the magnesium metal base
(1) gets mother solution and dilution according to fingerprint object size.For sheet metal or the not thick substrate of thickness, how much get solution according to being: the mother solution volume/object area of getting=45 μ l/ ㎝
2, and with 50 times of mother solution dilutions, mixing;
(2) object is immersed in the reaction solution reaction 50-60s;
(3) magnesium metal object is taken out, dry up with nitrogen, can obtain clear fingerprint.
C: be directed to ordinary carbon steel substrate laten fingerprints
(1) gets mother solution and dilution according to fingerprint object size.For sheet metal or the not thick substrate of thickness, how much get solution according to being: the mother solution volume/object area of getting=16 μ l/ ㎝
2, and with 100 times of mother solution dilutions, mixing;
(2) object is immersed in the reaction solution reaction 120s;
(3) the ordinary carbon steel object is taken out, dry up with nitrogen, can obtain clear fingerprint.
The present invention is that a kind of scene is real-time, and low-carbon (LC) is inexpensive, the method for health environment-friendly and Simple fast, and initiative is applied to manifesting of laten fingerprints with chemical metal replacement method.For the laten fingerprints in the substrate of relative active metal efficiently, manifest fast, principle is to live the weak salt of ripple such as copper-bath for manifesting reagent with metal, utilize the difference of burning reducing activity and the insulating properties of fingerprint residues thing, manifest the laten fingerprints on the multiple ripple metal object more alive.
The reagent of sulfuric acid copper solution that the present invention adopts, with low cost, composition simple, stable in properties.Be used for fingerprint manifestation and be swift in response, the fingerprint texture details is clear after manifesting, and presents the better the 3rd horizontal fingerprint image, and the practical operation personnel are injured without the person.The laten fingerprints that is particularly suitable for relatively reactive metal based ground efficiently, manifest fast.The sensitivity of the method and repeatability are all very good.
Beneficial effect of the present invention is: technical solution of the present invention is rationally novel in design, good reproducibility.The prepared liquid that manifests of the present invention is used for analyzing and testing than surface, active metal laten fingerprints and can greatly improves the sensitivity of detection and reduce testing cost and harmless to operator.
Description of drawings
Fig. 1 is that the present invention is optimized resulting effect picture as an example of Zn metal object example to manifesting liquid concentration, what the Zn sheet metal immersed respectively the dilution different multiples manifests mother solution reaction, and the time is 30s:(a) be that to manifest mother solution action effect (b) with 10 times of dilutions be that to manifest mother solution action effect (c) with 20 times of dilutions be that to manifest mother solution action effect (d) with 50 times of dilutions be to manifest the mother solution action effect with 100 times of dilutions.
Fig. 2 is that the present invention manifests under the concentration in the best as an example of Zn metal object example presentation time is optimized resulting effect picture, the Zn sheet metal respectively with optimize after concentration-response, the reaction different time: (a) effect 40s effect (b) is that effect 60s effect (c) is that effect 80s effect (d) is effect 100s effect.
Fig. 3 is the different metal surface oil developing latent finger prints using design sketch after the resulting process of the present invention manifests liquid concentration optimization and response time optimization: be that embodiment 1 effect (b) is that embodiment 2 effects (c) are embodiment 3 effects (a).
Fig. 4 is that the present invention manifests laten fingerprints with embodiment 3 resulting ordinary carbon steel object surfaces, and left figure is that fingerprint manifests rear ordinary optical image, and the right three figure are the characteristic information figure of fingerprint the second level of providing of left figure.
The specific embodiment
Further specify the present invention below in conjunction with example, this example only is used for specifying, and is not limited only to practical ranges of the present invention.
Embodiment 1
A kind of for than developing latent finger prints using new method on the object of active metal, take Zn metal object as example, for less or easily cut out object, can adopt and soak solwution method, concrete operations have following steps:
1) take copper sulphate pentahydrate, ultra-pure water as raw material, configuration copper sulfate mother solution.
2) electronic analytical balance takes by weighing the 12.484g copper sulphate pentahydrate, places the 100ml volumetric flask, adds ultra-pure water to the 100ml place, fully mixing.For subsequent use.
3) get mother solution and dilution according to fingerprint object size.For sheet metal or the not thick substrate of thickness, get how many foundations of solution: the mother solution volume/object area of getting=45 μ l/ ㎝
2
4) object area: 1.0 ㎝ * 1.0 ㎝=1.0 ㎝
2The required copper sulfate volume of the above-mentioned formula of foundation is μ l/ ㎝ approximately=45
2* 1.0 ㎝
2=45 μ l.
5) get 10 milliliters of clean beakers, pipettor adds the copper sulfate mother solution that 45 μ l configure, 100 times of ultra-pure water (or deionized water) dilutions, fully mixing.
6) fingerprint sample is immersed 5 with the tweezers gripping) in prepare in the solution standing and reacting 100s.
7) the Zn metal is taken out, dry up (if but condition does not allow hair-dryer to dry up or absorbent paper is blotted or ear washing bulb dries up from one jiao) with nitrogen, can obtain clear fingerprint and take pictures.
Larger or be difficult for cutting for object, can adopt dripping method, concrete operations are as follows:
1) by above-mentioned 1)-5) prepare to manifest liquid, get 5) the middle solution that configures, drip or be sprayed on object zone to be detected, standing and reacting 100s.
2) after reaction is finished, the zone is finished in reaction dry up (if but condition does not allow hair-dryer to dry up with nitrogen
3) or absorbent paper blot or ear washing bulb dries up from one jiao), can obtain clear fingerprint, take pictures.
Embodiment 2
Take Mg metal object as example, for less or easily cut out object, can adopt and soak solwution method, concrete operations have following steps:
1) take copper sulphate pentahydrate, ultra-pure water as raw material, configuration copper sulfate mother solution.
2) electronic analytical balance takes by weighing the 12.484g copper sulphate pentahydrate, places the 100ml volumetric flask, adds ultra-pure water to the 100ml place, fully mixing.For subsequent use.
3) get mother solution and dilution according to fingerprint object size.For sheet metal or the not thick substrate of thickness, get how many foundations of solution: the mother solution volume/object area of getting=40 μ l/ ㎝
2
4) object area: 0.9 ㎝ * 1.6 ㎝=1.4 ㎝
2'.The required copper sulfate volume of the above-mentioned formula of foundation is μ l/ ㎝ approximately=40
2* 1.4 ㎝
2=56 μ l.
5) get 10 milliliters of clean beakers, pipettor adds the copper sulfate mother solution that 56 μ l configure, 50 times of ultra-pure water (or deionized water) dilutions, fully mixing.
6) fingerprint sample is immersed 5 with the tweezers gripping) in prepare in the solution standing and reacting 50-60s.
7) the carbon steel metal object is taken out, dry up fast (if but condition does not allow absorbent paper to blot from one jiao) with nitrogen, can obtain clear fingerprint, take pictures.
Larger or be difficult for cutting out for object, can adopt dripping method, concrete operations are as follows:
1) by above-mentioned 1)-5) prepare to manifest liquid, get 5) the middle solution that configures, drip in object zone to be detected, standing and reacting 50-60s.
2) after reaction is finished, the zone is finished in reaction dry up (if but condition does not allow absorbent paper to blot from one jiao) with nitrogen, can obtain more clear fingerprint, take pictures.
Embodiment 3
Take the ordinary carbon steel object as example, for less or easily cut out object, can adopt and soak solwution method, concrete operations have following steps:
1) take copper sulphate pentahydrate, ultra-pure water as raw material, configuration copper sulfate mother solution.
2) electronic analytical balance takes by weighing the 12.484g copper sulphate pentahydrate, places the 100ml volumetric flask, adds ultra-pure water to the 100ml place, fully mixing.For subsequent use.
3) get mother solution and dilution according to fingerprint object size.For sheet metal or the not thick substrate of thickness, get how many foundations of solution: the mother solution volume/object area of getting=16 μ l/ ㎝
2
4) object area: 2.0 ㎝ * 1.5 ㎝=3.0 ㎝
2'.The required copper sulfate volume of the above-mentioned formula of foundation is μ l/ ㎝ approximately=16
2* 3.0 ㎝
2=48 μ l.
5) get 10 milliliters of clean beakers, pipettor adds the copper sulfate mother solution that 48 μ l configure, 100 times of ultra-pure water (or deionized water) dilutions, fully mixing.
6) fingerprint sample is immersed 5 with the tweezers gripping) in prepare in the solution standing and reacting 120s.
7) the carbon steel metal object is taken out, dry up (if but condition does not allow hair-dryer, ear washing bulb to dry up or absorbent paper is blotted or air-dry from one jiao) with nitrogen, can obtain clear fingerprint, take pictures.
Be difficult for more greatly cutting out for object, can adopt dripping method, concrete operations are as follows:
1) by above-mentioned 1)-5) prepare to manifest liquid, get 5) the middle solution that configures, drip or be sprayed on object zone to be detected, standing and reacting 120s.
2) after reaction is finished, the zone is finished in reaction dry up (if but condition does not allow hair-dryer, ear washing bulb to dry up or absorbent paper is blotted or air-dry from one jiao) with nitrogen, can obtain clear fingerprint, take pictures.
Claims (8)
1. method that adopts the chemical replacement deposition technique to manifest the metal surface laten fingerprints, it is characterized in that, live the weak salt of ripple such as copper-bath for manifesting reagent with metal, utilize the difference of burning reducing activity and the insulating properties of fingerprint residues thing, manifest the laten fingerprints on the multiple ripple metal object more alive; Step is as follows:
(1) take copper sulphate pentahydrate or anhydrous cupric sulfate, ultra-pure water or deionized water as raw material, configuration copper sulfate mother solution is as visualization reagent;
(2) according to the character of fingerprint object volume size and metal material, getting visualization reagent copper sulfate mother solution, to be diluted to needed multiple for subsequent use; Metal material comprises zinc, magnesium, ordinary carbon steel;
(3) fingerprint object sample is immersed in the good copper-bath of dilution or drip this solution to the sample surface, react a period of time;
(4) with drying up with nitrogen after the sample taking-up, under natural light, with the naked eye can observe directly clearly fingerprint, taking pictures to gather with digital camera manifests good fingerprint image.
2. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1, and it is characterized in that: described step (1) specifically comprises: take copper sulphate pentahydrate, ultra-pure water as raw material, and configuration copper sulfate mother solution; Take by weighing the 12.484g copper sulphate pentahydrate with analytical balance, place the 100ml volumetric flask, add ultra-pure water to the 100ml place, fully mixing is for subsequent use.
3. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1, it is characterized in that: be directed to zinc metallic substrates laten fingerprints:
(1) gets mother solution and dilution according to fingerprint object size; For sheet metal or the not thick substrate of thickness, how much get solution according to being: the mother solution volume/object area of getting=40 μ l/ ㎝
2, and with 100 times of mother solution dilutions, mixing;
(2) object is immersed in the reaction solution reaction 100s;
(3) zinc metal object is taken out, dry up with nitrogen, can obtain clear fingerprint.
4. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1, it is characterized in that: be directed to laten fingerprints at the bottom of the magnesium metal base:
(1) gets mother solution and dilution according to fingerprint object size; For sheet metal or the not thick substrate of thickness, how much get solution according to being: the mother solution volume/object area of getting=45 μ l/ ㎝
2, and with 50 times of mother solution dilutions, mixing;
(2) object is immersed in the reaction solution reaction 50-60s;
(3) magnesium metal object is taken out, dry up with nitrogen, can obtain clear fingerprint.
5. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1, it is characterized in that: be directed to ordinary carbon steel substrate laten fingerprints:
(1) gets mother solution and dilution according to fingerprint object size; For sheet metal or the not thick substrate of thickness, how much get solution according to being: the mother solution volume/object area of getting=16 μ l/ ㎝
2, and with 100 times of mother solution dilutions, mixing;
(2) object is immersed in the reaction solution reaction 120s;
(3) the ordinary carbon steel object is taken out, dry up with nitrogen, can obtain clear fingerprint.
6. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1-5, it is characterized in that: described fingerprint pattern refers to any one or the mixture in oiliness laten fingerprints, the antiperspirant laten fingerprints.
7. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1, it is characterized in that: described visualization reagent solution and contacting of sample object are to immerse fingerprint object sample in the good copper-bath of dilution or drip this solution to the sample surface or any mode that visualization reagent solution and sample is fully contacted can make its generation displacement reaction.
8. described employing chemical replacement deposition technique manifests the method for metal surface laten fingerprints according to claim 1, it is characterized in that: with copper sulfate mother solution dilution 50-100 doubly, sample at room temperature soaks 1～3min, in manifesting process, with 100-200 beats/min frequency oscillation sample in the horizontal direction, laten fingerprints is evenly manifested.
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Cited By (5)
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| CN103800015A (en) * | 2014-02-21 | 2014-05-21 | 北京科技大学 | Method for showing hidden fingerprints through smoking of candles and candle smoke ash |
| CN103937033A (en) * | 2014-04-13 | 2014-07-23 | 中南民族大学 | Gel-type fingerprint displaying agent and application thereof |
| CN105975962A (en) * | 2016-06-29 | 2016-09-28 | 西南大学 | Integrated method for implementing latent fingerprint development and transfer based on polydopamine film interface separation |
| CN106037754A (en) * | 2016-05-27 | 2016-10-26 | 江南大学 | Method for visualizing sebum latent fingerprints |
| CN113143262A (en) * | 2021-03-26 | 2021-07-23 | 中国刑事警察学院 | Latent fingerprint display and fixing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103800015A (en) * | 2014-02-21 | 2014-05-21 | 北京科技大学 | Method for showing hidden fingerprints through smoking of candles and candle smoke ash |
| CN103800015B (en) * | 2014-02-21 | 2015-08-12 | 北京科技大学 | The method of aobvious laten fingerprints smoked by a kind of wax candle flue dust |
| CN103937033A (en) * | 2014-04-13 | 2014-07-23 | 中南民族大学 | Gel-type fingerprint displaying agent and application thereof |
| CN106037754A (en) * | 2016-05-27 | 2016-10-26 | 江南大学 | Method for visualizing sebum latent fingerprints |
| CN105975962A (en) * | 2016-06-29 | 2016-09-28 | 西南大学 | Integrated method for implementing latent fingerprint development and transfer based on polydopamine film interface separation |
| CN105975962B (en) * | 2016-06-29 | 2018-11-23 | 西南大学 | A kind of integral method for realizing latent print development and transfer based on the separation of poly-dopamine film interface |
| CN113143262A (en) * | 2021-03-26 | 2021-07-23 | 中国刑事警察学院 | Latent fingerprint display and fixing method |
| CN113143262B (en) * | 2021-03-26 | 2023-09-22 | 中国刑事警察学院 | Method for showing and fixing latent fingerprints |
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